Autocadws and document Playbook

Since there is no application for Autocadws Playbook, I try to use it when needed via the web and it works very well by uploading pictures to boxes or dropbox. But wanting to load a drawing from the documents folder of Pb is not possible because in this folder are invisible files estensioni.dwg.
Suggestions?

Files & Folders lets you upload any file to various cloud services, including Dropbox and Box.

You guys should also include mediafire.com into files and folders, it's one of the most preferred online storage service. Certain file types for example .swf cannot be uploaded into mediafire via playbook browser. Like the op said playbook does not display these files.